Upgrade from SP1 to SP2 + Cumulative Updates

Hi All,

I just wanted to confirm a few issues that have been troubling me on the Test Environment:

If I am upgrading from MOSS 2007 SP1 (12.0.0.6219) 32bit to MOSS 2007 SP2 including cumulative updates.

Should I do the following;

1. Install SP2 and then each individual updates (obviously the versions from bottom to the top):

12.0.6557.5000       April Cumulative Update
12.0.6554.5000      February Cumulative Update
12.0.6550.5002       December Cumlative Update
12.0.6548.5000      October Cumulative Update
12.0.6545.5001      August Cumulative Update
12.0.6539.5000      June Cumulative Update
12.0.6535.5000      April Cumulative Update
12.0.6529.5000      February Cumulative Update
12.0.6524.5000       December Cumulative Update
12.0.6520.5000      October Cumulative Update
12.0.6514.5000      August Cumulative Update (New Build)
12.0.6510.5003      June Cumulative Update (CU) for Office SharePoint Server 2007
12.0.6510.5003      June Cumulative Update (CU) for Windows SharePoint Services 3.0
12.0.0.6504.5000       April Cumulative Update (CU)

After all the updates have been installed, then run PSCONFIG?  

Or should I run PSconfig for each version updates?  That is after installing April 2009 cumulative  WSS3.0 and MOSS 2007 updates, run psconfig.  Then proceed to install June 2009 Cumulative update, run psconfig and so on?

Or

2.  

- SP2
- April 2011 Cumulative Update  for WSS 3.0 and MOSS 2007
- Run PS config.

Will April 2011 Cumulative Update includes all updates since SP2?

What is the recommended steps?

Please note I will be doing this upgrade on the production environment that has already done AD migration, therefore causing Search not to work.  

Please let me know if you require further information!

Thanks for your help! Ezs.